Microbiology
The milk streptococci produce acetoin that gets spontaneously oxidized yielding a flavorings agent (responsible for aroma of butter) that is

diacetyl
acetone
acetyl coA
butyric acid

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Microbiology
Which of the following is true to prevent botulism from smoked fish?

The fish should be heated at its coolest part to at least 82°C for 30 min during or after smoking
All of these
Fish should be immediately frozen after packaging and kept frozen
Good sanitation should be maintained throughout production and handling

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